Haltec ECM tuning for more FE
Last weekend I picked up a new project car. A 1991 Chevy Cavalier station wagon. It's got a lot of performance modifications on it that would normally hurt FE, but it does have a Haltec full stand alone ECU. So, I'd like to start doing some programming changes to it to increase FE. I've got a good understanding on engines but I don't know where to start on tuning this beast. A friend of mine has a more radical engine in his Cavalier and has gotten 28 mpg on the highway with a couple of blasts to 140 mph and cruising at 75 to 80 mph.
A short list of the engine modifications are as follows; 1990 Pontiac Grand Prix Turbo 3.1L rotating assembly bored 0.030" over custom Crower camshaft (2,000 - 6,000 rpm power band) 30 lb/hr injectors (I know I can decrease pulsewidth on these down to 0.3 or 0.4 milliseconds) Garret T3/T04E turbocharger Haltec E6GMX https://www.cardomain.com/ride/783538 |
i had a '91 cavalier wagon RS a few years ago. really quick for an AT--camaro engine. also, it was very dependable and versatile. open the hatch, lay down the back seat for a make-shift truck bed.
wish i woulda kept it. maybe put in a 4 banger w/ manual tranny.:) |
Where to start is to find out where it is now.
Can you get a reading of the Haltech settings and the camshaft numbers? These two will determine pretty much everything about the engine from a FE and / or performance standpoint. Pete. |
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